I have a bunch of characters I could champ, and am looking for advice. For reference, I have nearly all of the 4* champed, no 5* champed (but Thor/Gambit covered; I just don't want to do 5* pvp). I can link gamependium if you want but I don't think it's terribly relevant.

My options are America Chavez, Ant-Man (1 cover each), Mr Fantastic (1 cover in a few days from daily rewards, 1 from my next 3* Black Panther cover), 3* R&G (I have a 266 one already, two covers pending), and some 2* that need rechamping in my farm.

I'm fairly certain I cannot get them all with 100k iso thus far. R&G is the nearest to expiring with a week left. I suspect I can do either 2 of the 4* or one 4* (America, most likely) and the 2/3* characters. Advice?